package com.example.temp;

public class Singleton {

    private Singleton() {

    }

//    private volatile static Singleton instance;

    public static Singleton getInstance() {

//        if (instance == null) {
//            synchronized (Singleton.class) {
//                if (instance == null) {
//                    instance = new Singleton();
//                }
//            }
//        }
//        return instance;

        return SingletonHolder.instance;
    }

    enum Singleton1{
        Singleton1;
    }

    private static class SingletonHolder{
        private static Singleton instance = new Singleton();

    }
}
